2120205545 has 16 divisors (see below), whose sum is σ = 2558226240. Its totient is φ = 1686869184.

The previous prime is 2120205523. The next prime is 2120205547. The reversal of 2120205545 is 5455020212.

It is a cyclic number.

It is not a de Polignac number, because 2120205545 - 2¹² = 2120201449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2120205547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1057514 + ... + 1059516.

It is an arithmetic number, because the mean of its divisors is an integer number (159889140).

Almost surely, 2^2120205545 is an apocalyptic number.

It is an amenable number.

2120205545 is a deficient number, since it is larger than the sum of its proper divisors (438020695).

2120205545 is a wasteful number, since it uses less digits than its factorization.

2120205545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 2120205545 is about 46045.6897548511. The cubic root of 2120205545 is about 1284.6731736057.

Adding to 2120205545 its reverse (5455020212), we get a palindrome (7575225757).

The spelling of 2120205545 in words is "two billion, one hundred twenty million, two hundred five thousand, five hundred forty-five".